Ieans for operatimg revolving chucks



(No Model.)

W. CQOPBR.

l MEANS POR OPERATING REVOLVING GHUGKS. No. 891,585. Patented 001;. 28, 1888.

Pijl. 183.1.

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VILLIAM COOPER, OF CHICAGO, ILLINOIS.

MEANS FOR OPERATiNG REVOLVING CHUCKS.

v SPECIFICATION forming part of Letters Patent No. 391,585, dated October 23, 1888.

Application filed February 23, 1888. Serial No. 265,060. (No model.)

To all whom, it may concern.-

Be it known that I, WILLIAM Coornn, a resident of the city of Chicago, cou nty of Cook, State of Illinois, have invented a certain new and useful Hydrostatie Chuck, of which the following is a specification, reference being had to the'accompanying drawings.

My invention relates to revolving chucks of the class in general use for making screws and other small articles; and it consists in operating the chuck by liquid-pressure.

Hitherto complicated constructions of various kinds have been used for clamping the chuck by mechanical pressure to the article to beheld. All of such devices are more or less objectionable on account of the slowness of their action, complexity of structure, imperfect control, and the unyielding character of the pressure. Of these defects the unyielding character of the pressure is a very material limitation to the capacity and efficiency ofthe chuck. The use of liquid overcomes this objection, giving a pressure which is comparatively elastic, automatically adapting itself to the work. rIhe chuck is also simpler in construction, susceptible of easier control, and has a wider range of work.

In the drawings I show a special construction invented by me for the application of the liquid-pressure; but I do not wish to be confined to this construction. I have conceived various other forms well adaptedv to the purpose. I show this construction simply by way of illustration, as one suitable means of carrying out the process.

Like letters referring to like parts, Figure 1 is a longitudinal vertical section of a revolving chuck operated by liquid-pressure, and Fig. 2 is a front` end view ofthe same.

A A are a pair of pillow-blocks arranged at a suitable distance apart and constituting a supporting-frame for the chuck.

B B are boxes rigidly secured to the blocks A A', respectively.

C is the chuck-spindle, having its bearings in said boxes and freely revolving therein.

C is a driving-pulley rigidly secured to the spindle C and coupled to any suitable source of power. (Not shown.)

The spindle C is provided with the customary taper hole c, and is otherwise of the usual construction, except that its central part is enlarged and made hollow, forming a cylinder, C', adapted to receive the liquid for operating the chuck-plunger. The boxes B B are provided with peripheral iianges b b, respectively, on their inner ends. The ends of the cylinder C bear against the inner ends of the boxes B B and the faces of their flanges b b', and the spindle is thereby securely held against longitudinal movement. The cylinder C is provided with the ports c c for the inletand outlet of the liquid.

D is an inclosing-shell closely fitting the cylinder C, and provided onits inner surface with the circumferential grooves al d in communication with the ports c and c, respectively. This shell D is also held from longitudinal gsplacement by the iianges b b on the boxes B. E is a valve-seat and liquid-chest formed inn tegral with the shell D, and provided with the ports e e, communicating with the grooves d and d, respectively, the inlet-pi pe F and the outlet-pipes H H.

The inlet-pipe F communicates with the reservoir G containing liquid under pressure. This may be an ordinary water-maim in case water is used, and the water in the same is kept at a sutliciently high pressure; or it may be any reservoir of any suitable liquid to which the requisite pressure may he given in any suitable way.

K is a double-balanced slide-valve located within the chest E and provided with a stem, le, passing out through a stuffing-box, L, in the end of the chest E. A suitable lever, M, may be pivoted to some suitable support and applied to the stem lc for the convenient operation of the valve.

N is the tapering chuck-head, consisting of the ordinary spring jaws or collets rigidly attached to the hollow operating stem lor plunger-shaft N', Which snugly fits the interior of i the spindle C. A part of this shaft Nwithin the cylinder D is enlarged, forming a piston, N, of the saine dia eter as the cylinder De This piston is shorter in length than the cylinder D, the difference' being sufficient to give the requisite throw for clamping and releasing the chuck-head N. 4

P represents a part of the rod of metal from which the articles are made, the saure being fed forward through the chuck-shaft iu any IOO suitable way, (not shown,) and clamped in a fixed position by the chuck-head.

The operation is apparent from the description already given. The spindle C and cylinder C are continuously revolved within the bearings B B and the shell D by power applied to the pulley C. Liquid is admitted to one or the other side of the piston N, moving the chuckshaft longitudinally, either forcing it into its clamping position or releasing it therefrom at the will of the operator by simply shifting the valve K. In the position shown the cylinder and chest ports c and e and c and e are open, the former set communicating with the inlet-pipe F and the latter set with the outlet-pipe H', and the outletpipe H is closed. If the valve be thrown to its opposite extreme position, H would be closed and e and H and e and F, respectively, would be in communication. In mid-position the valve will close both cylinder-ports.

I may use water, oil, or any other suitable kind of liquid.

What I claim, and desire to secure by Letters Patent of the United States in this application, 4is' as follows:

l. The combination, with arevolving chuck, of a cylinder adapted t0 reoeivealiquid under pressure, and a piston within said cylinder having a connection with said chuck for imparting an opening and closing movement thereto, substantially as described.

2. The combination, with a revolving chuck having an enlargement on its stem adapted to yserve as a piston, of a cylinder. inclosing the enlarged or piston portion of said stem adapted to receive a liquid under pressure and provided with ports for the inlet and outlet of the liquid, and valves for opening and closing said ports, substantially as described.

3. The combination, with a revolving chuck having a piston on its stem, of a spindle mounted on said stein having a cylinder inclosing said piston and provided with ports for the inlet and outlet of a liquid, fixed bearings for said spindle adapted to allow rotation and prevent longitudinal movement thereof, a shell inclosing said cylinder having ports in communication with the cylinder-ports and provided with a valve-seat, a hood or chest inclosing said valve-seat in communication with a liquid under pressure and provided with exhaust or outlet ports, and a valve in said chest for controlling the inlet and outlet of the liquid to and from the opposite sides of the piston, substantially as described.

TWILLIAM COOPER.

In presence of- GEORGE P.. HAMPTON, Jas. F. WILLIAMSON. 

